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https://issues.apache.org/jira/browse/SOLR-12798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16631059#comment-16631059
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Karl Wright commented on SOLR-12798:
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[~janhoy], so your suggestion is to use JSON format for the body, and put the
metadata into that. How do you suggest we handle binary data that is meant for
SolrCell? Encoding the binary in a JSON document is possible but in practice
this is quite verbose, yielding 3 or 4 bytes to one. Is that nevertheless your
official suggestion?
> Structural changes in SolrJ since version 7.0.0 have effectively disabled
> multipart post
> ----------------------------------------------------------------------------------------
>
> Key: SOLR-12798
> URL: https://issues.apache.org/jira/browse/SOLR-12798
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ
> Affects Versions: 7.4
> Reporter: Karl Wright
> Assignee: Karl Wright
> Priority: Major
> Attachments: HOT Balloon Trip_Ultra HD.jpg,
> SOLR-12798-approach.patch, no params in url.png, solr-update-request.txt
>
>
> Project ManifoldCF uses SolrJ to post documents to Solr. When upgrading from
> SolrJ 7.0.x to SolrJ 7.4, we encountered significant structural changes to
> SolrJ's HttpSolrClient class that seemingly disable any use of multipart
> post. This is critical because ManifoldCF's documents often contain metadata
> in excess of 4K that therefore cannot be stuffed into a URL.
> The changes in question seem to have been performed by Paul Noble on
> 10/31/2017, with the introduction of the RequestWriter mechanism. Basically,
> if a request has a RequestWriter, it is used exclusively to write the
> request, and that overrides the stream mechanism completely. I haven't
> chased it back to a specific ticket.
> ManifoldCF's usage of SolrJ involves the creation of
> ContentStreamUpdateRequests for all posts meant for Solr Cell, and the
> creation of UpdateRequests for posts not meant for Solr Cell (as well as for
> delete and commit requests). For our release cycle that is taking place
> right now, we're shipping a modified version of HttpSolrClient that ignores
> the RequestWriter when dealing with ContentStreamUpdateRequests. We
> apparently cannot use multipart for all requests because on the Solr side we
> get "pfountz Should not get here!" errors on the Solr side when we do, which
> generate HTTP error code 500 responses. That should not happen either, in my
> opinion.
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